dragosmg commented on a change in pull request #12179:
URL: https://github.com/apache/arrow/pull/12179#discussion_r787149579
##########
File path: r/R/dplyr-join.R
##########
@@ -117,10 +117,33 @@ handle_join_by <- function(by, x, y) {
if (is.null(names(by))) {
by <- set_names(by)
}
- # TODO: nicer messages?
- stopifnot(
- all(names(by) %in% names(x)),
- all(by %in% names(y))
- )
+
+ missing_x_cols <- setdiff(names(by), names(x))
+ if (length(missing_x_cols) > 0) {
+ message <- paste(
+ "Join",
+ ngettext(length(missing_x_cols), "column", "columns"),
+ "must be present in data."
+ )
+ message_x <- paste(
+ oxford_paste(missing_x_cols, quote_symbol = "`"),
+ "not present in x."
+ )
+ abort(c(message, x = message_x))
+ }
+
+ missing_y_cols <- setdiff(by, names(y))
+ if (length(missing_y_cols) > 0) {
+ message <- paste(
+ "Join",
+ ngettext(length(missing_y_cols), "column", "columns"),
+ "must be present in data."
+ )
+ message_y <- paste(
+ oxford_paste(missing_y_cols, quote_symbol = "`"),
+ "not present in y."
+ )
+ abort(c(message, x = message_y))
+ }
Review comment:
I had a similar thought and I have a hunch this might be the reason for
{dplyr} keeping things simpler / a bit more ambiguous. I will look into it.
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